diff --git a/bitcoin/src/consensus/serde.rs b/bitcoin/src/consensus/serde.rs
index 6c9c9c32..a6b88aed 100644
--- a/bitcoin/src/consensus/serde.rs
+++ b/bitcoin/src/consensus/serde.rs
@@ -98,7 +98,6 @@ pub mod hex {
     }
 
     // Newtypes to hide internal details.
-    // TODO: statically prove impossible cases
 
     /// Error returned when a hex string decoder can't be created.
     #[derive(Debug, Clone, Copy, PartialEq, Eq)]